LMH6521_16 Datasheet, PDF (1/29 Pages) Texas Instruments – High Performance Dual DVGA

LMH6521
www.ti.com
SNOSB47D – MAY 2011 – REVISED MARCH 2013
High Performance Dual DVGA
Check for Samples: LMH6521
FEATURES
1
•2 OIP3 of 48.5 dBm at 200 MHz
• Maximum Voltage Gain of 26 dB
• Gain Range of 31.5 dB with 0.5dB Step Size
• Channel Gain Matching of ±0.04 dB
• Noise Figure of 7.3 dB at Maximum Gain
• -3 dB Bandwidth of 1200 MHz
• Low Power Dissipation
• Independent Channel Power Down
• Three Gain Control Modes:
– Parallel Interface
– Serial Interface (SPI)
– Pulse Mode Interface
• Temperature Range –40°C to +85°C
• Thermally Enhanced, 32–Pin WQFN Package
APPLICATIONS
• Cellular Base Stations
• Wideband and Narrowband IF Sampling
Receivers
• Wideband Direct Conversion
• Digital Pre-Distortion
• ADC Driver
DESCRIPTION
The LMH6521 contains two high performance,
digitally controlled variable gain amplifiers (DVGA).
Both channels of the LMH6521 have an independent,
digitally controlled attenuator followed by a high
linearity, differential output amplifier. Each block has
been optimized for low distortion and maximum
system design flexibility. Each channel has a high
speed power down mode.
The internal digitally controlled attenuator provides
precise 0.5dB gain steps over a 31.5dB range. Serial
and parallel programming options are provided. Serial
mode programming utilizes the SPI interface. A Pulse
mode is also offered where simple up or down
commands can change the gain one step at a time.
The output amplifier has a differential output allowing
10V_PPD signal swings on a single 5V supply. The low
impedance output provides maximum flexibility when
driving filters or analog to digital converters.
+5V
0.20
2.0
INA+
INA-
ATTEN_A
LATCH _A
EN_A
PULSE_A
SPI
ATTEN_B
LATCH _B
EN_B
PULSE_B
INB+
INB-
Attenuator
0 dB to 31.5 dB
6
2
4
Digital
Control
6
2
Attenuator
0 dB to 31.5 dB
26 dB
26 dB
OUTA+
OUTA-
OUTB+
OUTB-
0.15
1.5
0.10
Gain Matching Error
1.0
0.05
0.5
0.00
0.0
-0.05
-0.5
-0.10
-0.15
Phase Matching Error ^-1.0
-1.5
-0.20
0
-2.0
4 8 12 16 20 24 28 32
ATTENUATION (dB)
GND
Figure 1. LMH6521 Block Diagram
Figure 2. Channel Matching Error (Ch A – Ch B)
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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